Merge commit '23c7930d27fe11c4655e1291a07a821dbbaba78d' as 'funtools'

1 files changed, 2879 insertions, 0 deletions

diff --git a/funtools/gnu/sort.c b/funtools/gnu/sort.c
new file mode 100644
index 0000000..56d8bb2
--- /dev/null
+++ b/funtools/gnu/sort.c
@@ -0,0 +1,2879 @@
+/* sort - sort lines of text (with all kinds of options).
+   Copyright (C) 1988, 1991, 1992, 1993, 1994, 1995 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+   Written December 1988 by Mike Haertel.
+   The author may be reached (Email) at the address mike@gnu.ai.mit.edu,
+   or (US mail) as Mike Haertel c/o Free Software Foundation. */
+
+/* define to sort binary data */
+/* #define SAOMOD_BINARY 1 */
+
+/* define to sorts on hms, mjd */
+/* #define SAOMOD_ASTRO  1 */
+
+/* define to sort RDB tables */
+/* #define SAOMOD_TABLE  1 */
+
+/* always define --this just marks code fixes */
+#define SAOMOD_FIX    1
+
+/* Get isblank from GNU libc.  */
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+
+#ifndef RTMX
+#include <signal.h>
+#else
+#include <sys/signal.h>
+#endif
+
+#if HAVE_CONFIG_H
+#include <conf.h>
+#endif
+
+#include <stdio.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+#include "system.h"
+#ifdef LOCAL_INCLUDES
+#include "version.h"
+#include "error.h"
+#endif
+
+#ifdef SAOMOD_TABLE
+#include <table.h>
+#endif
+#ifdef SAOMOD_ASTRO
+double mjd();
+#endif
+
+#ifdef _POSIX_VERSION
+#include <limits.h>
+#else
+#ifndef UCHAR_MAX
+#define UCHAR_MAX 255
+#endif
+#endif
+
+#if HAVE_LONG_LONG
+typedef long long longlong;
+#else
+typedef long longlong;
+#endif
+
+static void usage ();
+
+#ifdef SAOMOD_TABLE
+        int table = 0;
+#endif
+
+#ifdef SAOMOD_BINARY
+	int BinarySort = 0;
+#endif
+
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#define UCHAR_LIM (UCHAR_MAX + 1)
+#define UCHAR(c) ((unsigned char) (c))
+
+#ifndef DEFAULT_TMPDIR
+#define DEFAULT_TMPDIR "/tmp"
+#endif
+
+/* The kind of blanks for '-b' to skip in various options. */
+enum blanktype { bl_start, bl_end, bl_both };
+
+/* The name this program was run with. */
+char *program_name;
+
+/* Table of digits. */
+static int digits[UCHAR_LIM];
+
+/* Table of white space. */
+static int blanks[UCHAR_LIM];
+
+/* Table of non-printing characters. */
+static int nonprinting[UCHAR_LIM];
+
+/* Table of non-dictionary characters (not letters, digits, or blanks). */
+static int nondictionary[UCHAR_LIM];
+
+/* Translation table folding lower case to upper. */
+static char fold_toupper[UCHAR_LIM];
+
+/* Table mapping 3-letter month names to integers.
+   Alphabetic order allows binary search. */
+static struct month
+{
+  char *name;
+  int val;
+} const monthtab[] =
+{
+  {"APR", 4},
+  {"AUG", 8},
+  {"DEC", 12},
+  {"FEB", 2},
+  {"JAN", 1},
+  {"JUL", 7},
+  {"JUN", 6},
+  {"MAR", 3},
+  {"MAY", 5},
+  {"NOV", 11},
+  {"OCT", 10},
+  {"SEP", 9}
+};
+
+/* During the merge phase, the number of files to merge at once. */
+#define NMERGE 48
+
+/* Initial buffer size for in core sorting.  Will not grow unless a
+   line longer than this is seen. */
+static int sortalloc = 1024 * 1024;
+
+/* Initial buffer size for in core merge buffers.  Bear in mind that
+   up to NMERGE * mergealloc bytes may be allocated for merge buffers. */
+static int mergealloc =  32 * 1024;
+
+/* Guess of average line length. */
+static int linelength = 30;
+
+/* Maximum number of elements for the array(s) of struct line's, in bytes.  */
+#define LINEALLOC (8 * 256 * 1024)
+
+/* Prefix for temporary file names. */
+static char *temp_file_prefix;
+
+/* Flag to reverse the order of all comparisons. */
+static int reverse;
+
+/* Flag for stable sort.  This turns off the last ditch bytewise
+   comparison of lines, and instead leaves lines in the same order
+   they were read if all keys compare equal.  */
+static int stable;
+
+/* Tab character separating fields.  If NUL, then fields are separated
+   by the empty string between a non-whitespace character and a whitespace
+   character. */
+static char tab = '\0';
+
+/* Nonzero if any of the input files are the standard input. */
+static int have_read_stdin;
+
+/* Lines are held in core as counted strings. */
+struct line
+{
+  char *text;			/* Text of the line. */
+  int length;			/* Length not including final newline. */
+  char *keybeg;			/* Start of first key. */
+  char *keylim;			/* Limit of first key. */
+#ifdef SAOMOD_ASTRO
+  int   flag;
+  double value;			/* the chached value of the a numeric key. */
+#endif
+};
+
+/* Arrays of lines. */
+struct lines
+{
+  struct line *lines;		/* Dynamically allocated array of lines. */
+  int used;			/* Number of slots used. */
+  int alloc;			/* Number of slots allocated. */
+  int limit;			/* Max number of slots to allocate.  */
+};
+
+/* Input buffers. */
+struct buffer
+{
+  char *buf;			/* Dynamically allocated buffer. */
+  int used;			/* Number of bytes used. */
+  int alloc;			/* Number of bytes allocated. */
+  int left;			/* Number of bytes left after line parsing. */
+};
+
+/* Lists of key field comparisons to be tried. */
+static struct keyfield
+{
+  int sword;			/* Zero-origin 'word' to start at. */
+  int schar;			/* Additional characters to skip. */
+  int skipsblanks;		/* Skip leading white space at start. */
+  int eword;			/* Zero-origin first word after field. */
+  int echar;			/* Additional characters in field. */
+  int skipeblanks;		/* Skip trailing white space at finish. */
+  int *ignore;			/* Boolean array of characters to ignore. */
+  char *translate;		/* Translation applied to characters. */
+  int numeric;			/* Flag for numeric comparison. */
+  int month;			/* Flag for comparison by month name. */
+  int reverse;			/* Reverse the sense of comparison. */
+  int nzone;
+  double dzone;
+  int	 btype;
+  struct keyfield *next;	/* Next keyfield to try. */
+} keyhead;
+
+/* The list of temporary files. */
+static struct tempnode
+{
+  char *name;
+  struct tempnode *next;
+} temphead;
+
+
+/* Flag to remove consecutive duplicate lines from the output.
+   Only the last of a sequence of equal lines will be output. */
+static int unique = 0;
+static int differ = 0;
+static int countr = 0;
+static int setcnt = 1;
+
+
+/* Clean up any remaining temporary files. */
+
+static void
+cleanup ()
+{
+  struct tempnode *node;
+
+  for (node = temphead.next; node; node = node->next)
+    unlink (node->name);
+}
+
+/* Allocate N bytes of memory dynamically, with error checking.  */
+
+char *
+xmalloc (n)
+     unsigned n;
+{
+  char *p;
+
+  p = (char *)malloc (n);
+  if (p == 0)
+    {
+      fprintf (stderr, "virtual memory exhausted");
+      cleanup ();
+      exit (2);
+    }
+  return p;
+}
+
+/* Change the size of an allocated block of memory P to N bytes,
+   with error checking.
+   If P is NULL, run xmalloc.
+   If N is 0, run free and return NULL.  */
+
+char *
+xrealloc (p, n)
+     char *p;
+     unsigned n;
+{
+  if (p == 0)
+    return (char *)xmalloc (n);
+  if (n == 0)
+    {
+      free (p);
+      return 0;
+    }
+  p = (char *)realloc (p, n);
+  if (p == 0)
+    {
+      fprintf (stderr, "virtual memory exhausted");
+      cleanup ();
+      exit (2);
+    }
+  return p;
+}
+static FILE *
+xfopen (file, how)
+     char *file, *how;
+{
+#ifdef SAOMOD_TABLE
+  FILE *fp = Open(file, how);
+#else
+  FILE *fp;
+  if ( !strcmp(file, "-") && !strcmp(how, "r") ) fp = stdin;
+  else if ( !strcmp(file, "-") && !strcmp(how, "w") ) fp = stdout;
+  else fp = fopen(file, how);
+#endif
+
+  if (fp == 0) {
+      perror (file);
+      cleanup ();
+      exit (2);
+  }
+
+  if (fp == stdin) have_read_stdin = 1;
+
+  return fp;
+}
+
+static void
+xfclose (fp)
+     FILE *fp;
+{
+  if (fp == stdin) {
+      /* Allow reading stdin from tty more than once. */
+      if (feof (fp))
+	clearerr (fp);
+  } else if ( fp == stdout ) {
+      if (fflush (fp) != 0) {
+	  perror ("flushing file");
+	  cleanup ();
+	  exit (2);
+      }
+  } else {
+#ifdef SAOMOD_TABLE
+      if ( Close(fp) != 0 ) {
+#else
+      if ( fclose(fp) != 0 ) {
+#endif
+
+	  perror ("closing file");
+	  cleanup ();
+	  exit (2);
+      }
+  }
+}
+
+static void
+xfwrite (buf, size, nelem, fp)
+     char *buf;
+     int size, nelem;
+     FILE *fp;
+{
+  if (fwrite (buf, size, nelem, fp) != (size_t)nelem)
+    {
+      perror ("writing file");
+      cleanup ();
+      exit (2);
+    }
+}
+
+/* Return a name for a temporary file. */
+
+static char *
+tempname ()
+{
+  static int seq;
+  int len = strlen (temp_file_prefix);
+  char *name = xmalloc (len + 16);
+  struct tempnode *node =
+  (struct tempnode *) xmalloc (sizeof (struct tempnode));
+
+  sprintf (name,
+	   "%s%ssort%5.5d%5.5d",
+	   temp_file_prefix,
+	   (len && temp_file_prefix[len - 1] != '/') ? "/" : "",
+	   (unsigned int) getpid () & 0xffff, ++seq);
+  node->name = name;
+  node->next = temphead.next;
+  temphead.next = node;
+  return name;
+}
+
+/* Search through the list of temporary files for NAME;
+   remove it if it is found on the list. */
+
+static void
+zaptemp (name)
+     char *name;
+{
+  struct tempnode *node, *temp;
+
+  for (node = &temphead; node->next; node = node->next)
+    if (!strcmp (name, node->next->name))
+      break;
+  if (node->next)
+    {
+      temp = node->next;
+      unlink (temp->name);
+      free (temp->name);
+      node->next = temp->next;
+      free ((char *) temp);
+    }
+}
+
+/* Initialize the character class tables. */
+
+static void
+inittables ()
+{
+  int i;
+
+  for (i = 0; i < UCHAR_LIM; ++i)
+    {
+      if (ISBLANK (i))
+	blanks[i] = 1;
+      if (ISDIGIT (i))
+	digits[i] = 1;
+      if (!ISPRINT (i))
+	nonprinting[i] = 1;
+      if (!ISALNUM (i) && !ISBLANK (i))
+	nondictionary[i] = 1;
+      if (ISLOWER (i))
+	fold_toupper[i] = toupper (i);
+      else
+	fold_toupper[i] = i;
+    }
+}
+
+/* Initialize BUF, allocating ALLOC bytes initially. */
+
+static void
+initbuf (buf, alloc)
+     struct buffer *buf;
+     int alloc;
+{
+  buf->alloc = alloc;
+  buf->buf = xmalloc (buf->alloc);
+  buf->used = buf->left = 0;
+}
+
+/* Fill BUF reading from FP, moving buf->left bytes from the end
+   of buf->buf to the beginning first.	If EOF is reached and the
+   file wasn't terminated by a newline, supply one.  Return a count
+   of bytes buffered. */
+
+static int
+fillbuf (buf, fp)
+     struct buffer *buf;
+     FILE *fp;
+{
+  int cc;
+
+  memmove (buf->buf, buf->buf + buf->used - buf->left, buf->left);
+  buf->used = buf->left;
+
+#ifdef SAOMOD_BINARY
+  if ( BinarySort ) {
+	cc = fread (buf->buf + buf->used, 1, buf->alloc - buf->used, fp);
+
+	buf->used += cc;
+
+	return buf->used;
+  }
+#endif
+
+  while (!feof (fp) && (buf->used == 0 || !memchr (buf->buf, '\n', buf->used)))
+    {
+      if (buf->used == buf->alloc)
+	{
+	  buf->alloc *= 2;
+	  buf->buf = xrealloc (buf->buf, buf->alloc);
+	}
+      cc = fread (buf->buf + buf->used, 1, buf->alloc - buf->used, fp);
+      if (ferror (fp))
+	{
+	  perror ("reading file");
+	  cleanup ();
+	  exit (2);
+	}
+      buf->used += cc;
+    }
+
+  if (feof (fp) && buf->used && buf->buf[buf->used - 1] != '\n')
+    {
+      if (buf->used == buf->alloc)
+	{
+	  buf->alloc *= 2;
+	  buf->buf = xrealloc (buf->buf, buf->alloc);
+	}
+      buf->buf[buf->used++] = '\n';
+    }
+
+  return buf->used;
+}
+
+/* Initialize LINES, allocating space for ALLOC lines initially.
+   LIMIT is the maximum possible number of lines to allocate space
+   for, ever.  */
+
+static void
+initlines (lines, alloc, limit)
+     struct lines *lines;
+     int alloc;
+     int limit;
+{
+  lines->alloc = alloc;
+  lines->lines = (struct line *) xmalloc (lines->alloc * sizeof (struct line));
+  lines->used = 0;
+  lines->limit = limit;
+}
+
+/* Return a pointer to the first character of the field specified
+   by KEY in LINE. */
+
+static char *
+begfield (line, key)
+     struct line *line;
+     struct keyfield *key;
+{
+  register char *ptr = line->text, *lim = ptr + line->length;
+  register int sword = key->sword, schar = key->schar;
+
+  if (tab)
+    while (ptr < lim && sword--)
+      {
+	while (ptr < lim && *ptr != tab)
+	  ++ptr;
+	if (ptr < lim)
+	  ++ptr;
+      }
+  else
+    while (ptr < lim && sword--)
+      {
+	while (ptr < lim && blanks[UCHAR (*ptr)])
+	  ++ptr;
+	while (ptr < lim && !blanks[UCHAR (*ptr)])
+	  ++ptr;
+      }
+
+  if (key->skipsblanks
+#ifdef SAOMOD_TABLE
+||table
+#endif
+      )
+    while (ptr < lim && blanks[UCHAR (*ptr)])
+      ++ptr;
+
+  while (ptr < lim && schar--)
+    ++ptr;
+
+  return ptr;
+}
+
+/* Return the limit of (a pointer to the first character after) the field
+   in LINE specified by KEY. */
+
+static char *
+limfield (line, key)
+     struct line *line;
+     struct keyfield *key;
+{
+  register char *ptr = line->text, *lim = ptr + line->length;
+  register int eword = key->eword, echar = key->echar;
+
+  if ( eword == -1 ) {
+	eword = 1;
+	echar = 0;
+  }
+
+  if (tab)
+    while (ptr < lim && eword--)
+      {
+	while (ptr < lim && *ptr != tab)
+	  ++ptr;
+	if (ptr < lim && (eword > 0 || key->skipeblanks))
+	  ++ptr;
+      }
+  else
+    while (ptr < lim && eword--)
+      {
+	while (ptr < lim && blanks[UCHAR (*ptr)])
+	  ++ptr;
+	while (ptr < lim && !blanks[UCHAR (*ptr)])
+	  ++ptr;
+      }
+
+#ifdef SAOMOD_TABLE
+  if ( table ) {
+    if ( blanks[UCHAR (*ptr)] ) {
+	while (ptr > line->text && blanks[UCHAR (*ptr)] ) --ptr;
+        ptr++;
+    }
+  } else
+#endif
+    {
+  if (key->skipeblanks)
+    while (ptr < lim && blanks[UCHAR (*ptr)])
+      ++ptr;
+
+  while (ptr < lim && echar--)
+    ++ptr;
+ }
+
+  return ptr;
+}
+
+/* Find the lines in BUF, storing pointers and lengths in LINES.
+   Also replace newlines with NULs. */
+
+static void
+findlines (buf, lines)
+     struct buffer *buf;
+     struct lines *lines;
+{
+  register char *beg = buf->buf, *lim = buf->buf + buf->used, *ptr;
+  struct keyfield *key = keyhead.next;
+
+  lines->used = 0;
+
+#ifdef SAOMOD_BINARY
+  if ( lim - beg < BinarySort ) {
+	fprintf(stderr, "Odd sized records in buffer?\n");
+	cleanup();
+	abort();
+  }
+#else
+  if ( lim - beg < 0 ) {
+	fprintf(stderr, "Odd sized records in buffer?\n");
+	cleanup();
+	abort();
+  }
+#endif
+	
+#ifdef SAOMOD_BINARY
+  if ( BinarySort ) {
+      while ( beg + BinarySort <= lim )
+	{
+
+	  if (lines->used == lines->alloc)
+	    {
+	      lines->alloc *= 2;
+	      lines->lines = (struct line *)
+		xrealloc ((char *) lines->lines,
+			  lines->alloc * sizeof (struct line));
+	    }
+
+	  lines->lines[lines->used].text = beg;
+	  lines->lines[lines->used].length = BinarySort;
+#ifdef SAOMOD_ASTRO
+          lines->lines[lines->used].flag = 0;
+#endif
+
+	  beg += BinarySort;
+	  lines->used++;
+	}
+
+  	buf->left = lim - beg;
+	return;
+  }
+#endif
+  
+  while (beg < lim && (ptr = memchr (beg, '\n', lim - beg))
+	 && lines->used < lines->limit)
+    {
+      /* There are various places in the code that rely on a NUL
+	 being at the end of in-core lines; NULs inside the lines
+	 will not cause trouble, though. */
+      *ptr = '\0';
+
+      if (lines->used == lines->alloc)
+	{
+	  lines->alloc *= 2;
+	  lines->lines = (struct line *)
+	    xrealloc ((char *) lines->lines,
+		      lines->alloc * sizeof (struct line));
+	}
+
+      lines->lines[lines->used].text = beg;
+      lines->lines[lines->used].length = ptr - beg;
+#ifdef SAOMOD_ASTRO
+      lines->lines[lines->used].flag = 0;
+#endif
+
+      /* Precompute the position of the first key for efficiency. */
+      if (key)
+	{
+	  if ( key->eword >= 0
+#ifdef SAOMOD_TABLE
+ || table 
+#endif
+	       )
+	    lines->lines[lines->used].keylim =
+	      limfield (&lines->lines[lines->used], key);
+	  else
+	    lines->lines[lines->used].keylim = ptr;
+
+          if (key->sword >= 0)
+            lines->lines[lines->used].keybeg =
+              begfield (&lines->lines[lines->used], key);
+          else
+            {
+              if (key->skipsblanks
+#ifdef SAOMOD_TABLE
+||table
+#endif
+)
+                while (blanks[UCHAR (*beg)])
+                  ++beg;
+              lines->lines[lines->used].keybeg = beg;
+            }
+	}
+      else
+	{
+	  lines->lines[lines->used].keybeg = 0;
+	  lines->lines[lines->used].keylim = 0;
+	}
+
+      ++lines->used;
+      beg = ptr + 1;
+    }
+
+  buf->left = lim - beg;
+}
+
+/* Compare strings A and B containing decimal fractions < 1.  Each string
+   should begin with a decimal point followed immediately by the digits
+   of the fraction.  Strings not of this form are considered to be zero. */
+
+static int
+fraccompare (a, b)
+     register char *a, *b;
+{
+  register int tmpa = UCHAR (*a), tmpb = UCHAR (*b);
+
+  if (tmpa == '.' && tmpb == '.')
+    {
+      do
+	tmpa = UCHAR (*++a), tmpb = UCHAR (*++b);
+      while (tmpa == tmpb && digits[tmpa]);
+      if (digits[tmpa] && digits[tmpb])
+	return tmpa - tmpb;
+      if (digits[tmpa])
+	{
+	  while (tmpa == '0')
+	    tmpa = UCHAR (*++a);
+	  if (digits[tmpa])
+	    return 1;
+	  return 0;
+	}
+      if (digits[tmpb])
+	{
+	  while (tmpb == '0')
+	    tmpb = UCHAR (*++b);
+	  if (digits[tmpb])
+	    return -1;
+	  return 0;
+	}
+      return 0;
+    }
+  else if (tmpa == '.')
+    {
+      do
+	tmpa = UCHAR (*++a);
+      while (tmpa == '0');
+      if (digits[tmpa])
+	return 1;
+      return 0;
+    }
+  else if (tmpb == '.')
+    {
+      do
+	tmpb = UCHAR (*++b);
+      while (tmpb == '0');
+      if (digits[tmpb])
+	return -1;
+      return 0;
+    }
+  return 0;
+}
+
+/* Compare strings A and B as numbers without explicitly converting them to
+   machine numbers.  Comparatively slow for short strings, but asymptotically
+   hideously fast. */
+
+static int
+numcompare (a, b)
+     register char *a, *b;
+{
+  register int tmpa, tmpb, loga, logb, tmp;
+
+  tmpa = UCHAR (*a), tmpb = UCHAR (*b);
+
+
+  while (blanks[tmpa])
+    tmpa = UCHAR (*++a);
+  while (blanks[tmpb])
+    tmpb = UCHAR (*++b);
+
+  if (tmpa == '-')
+    {
+      tmpa = UCHAR (*++a);
+      if (tmpb != '-')
+	{
+	  if (digits[tmpa] && digits[tmpb])
+	    return -1;
+	  return 0;
+	}
+      tmpb = UCHAR (*++b);
+
+      while (tmpa == '0')
+	tmpa = UCHAR (*++a);
+      while (tmpb == '0')
+	tmpb = UCHAR (*++b);
+
+      while (tmpa == tmpb && digits[tmpa])
+	tmpa = UCHAR (*++a), tmpb = UCHAR (*++b);
+
+      if ((tmpa == '.' && !digits[tmpb]) || (tmpb == '.' && !digits[tmpa]))
+	return -fraccompare (a, b);
+
+      if (digits[tmpa])
+	for (loga = 1; digits[UCHAR (*++a)]; ++loga)
+	  ;
+      else
+	loga = 0;
+
+      if (digits[tmpb])
+	for (logb = 1; digits[UCHAR (*++b)]; ++logb)
+	  ;
+      else
+	logb = 0;
+
+      if ((tmp = logb - loga) != 0)
+	return tmp;
+
+      if (!loga)
+	return 0;
+
+      return tmpb - tmpa;
+    }
+  else if (tmpb == '-')
+    {
+      if (digits[UCHAR (tmpa)] && digits[UCHAR (*++b)])
+	return 1;
+      return 0;
+    }
+  else
+    {
+      while (tmpa == '0')
+	tmpa = UCHAR (*++a);
+      while (tmpb == '0')
+	tmpb = UCHAR (*++b);
+
+      while (tmpa == tmpb && digits[tmpa])
+	tmpa = UCHAR (*++a), tmpb = UCHAR (*++b);
+
+      if ((tmpa == '.' && !digits[tmpb]) || (tmpb == '.' && !digits[tmpa]))
+	return fraccompare (a, b);
+
+      if (digits[tmpa])
+	for (loga = 1; digits[UCHAR (*++a)]; ++loga)
+	  ;
+      else
+	loga = 0;
+
+      if (digits[tmpb])
+	for (logb = 1; digits[UCHAR (*++b)]; ++logb)
+	  ;
+      else
+	logb = 0;
+
+      if ((tmp = loga - logb) != 0)
+	return tmp;
+
+      if (!loga)
+	return 0;
+
+      return tmpa - tmpb;
+    }
+}
+
+/* Return an integer <= 12 associated with month name S with length LEN,
+   0 if the name in S is not recognized. */
+
+static int
+getmonth (s, len)
+     char *s;
+     int len;
+{
+  char month[4];
+  register int i, lo = 0, hi = 12;
+
+  while (len > 0 && blanks[UCHAR(*s)])
+    ++s, --len;
+
+  if (len < 3)
+    return 0;
+
+  for (i = 0; i < 3; ++i)
+    month[i] = fold_toupper[UCHAR (s[i])];
+  month[3] = '\0';
+
+  while (hi - lo > 1)
+    if (strcmp (month, monthtab[(lo + hi) / 2].name) < 0)
+      hi = (lo + hi) / 2;
+    else
+      lo = (lo + hi) / 2;
+  if (!strcmp (month, monthtab[lo].name))
+    return monthtab[lo].val;
+  return 0;
+}
+
+/* Compare two lines A and B trying every key in sequence until there
+   are no more keys or a difference is found. */
+
+static int
+keycompare (a, b)
+     struct line *a, *b;
+{
+  register char *texta, *textb, *lima, *limb, *translate;
+  register int *ignore;
+  struct keyfield *key;
+  int diff = 0, iter = 0, lena, lenb;
+
+  for (key = keyhead.next; key; key = key->next, ++iter)
+    {
+      ignore = key->ignore;
+      translate = key->translate;
+
+#ifdef SAOMOD_BINARY
+      if ( BinarySort ) {
+	switch ( key->btype ) {
+	     case 'c' :
+	     case 'b' : {
+		char	va, vb;
+
+		va = *((char *) a->text+key->sword);
+		vb = *((char *) b->text+key->sword);
+
+		if ( key->nzone ) {
+		    va = (int) (va / key->dzone);
+		    vb = (int) (vb / key->dzone);
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'C' :
+	     case 'B' : {
+		unsigned char	va, vb;
+
+		va = *((unsigned char *) a->text+key->sword);
+		vb = *((unsigned char *) b->text+key->sword);
+
+		if ( key->nzone ) {
+		    va = (int) (va / key->dzone);
+		    vb = (int) (vb / key->dzone);
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 's' : {
+		short	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(short));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(short));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(short));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(short));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'S' : {
+		unsigned short	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(short));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(short));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(short));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(short));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'i' : {
+		int	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(int));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(int));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(int));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(int));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'l' : {
+		longlong	va, vb;
+#if HAVE_LONG_LONG == 0
+		fprintf (stderr, "long long support was not built into this program\n");
+		exit(1);
+#endif
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(longlong));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(longlong));
+		    if ( key->nzone ) {
+			va = (longlong) (va / key->dzone);
+			vb = (longlong) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(longlong));
+		        if ( key->nzone ) va = (longlong) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(longlong));
+		        if ( key->nzone ) va = (longlong) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'I' : {
+		unsigned int	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(int));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(int));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(int));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(int));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'f' : {
+		float	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(float));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(float));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(float));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(float));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 'd' : {
+		double	va, vb;
+
+		if ( !iter ) {
+		    memcpy(&va, (void *) (a->text+key->sword), sizeof(double));
+		    memcpy(&vb, (void *) (b->text+key->sword), sizeof(double));
+		    if ( key->nzone ) {
+			va = (int) (va / key->dzone);
+			vb = (int) (vb / key->dzone);
+		    }
+		} else {
+#ifdef SAOMOD_ASTRO
+		    if ( a->flag ) va = a->value;
+		    else {
+#endif
+		        memcpy(&va, (void *) (a->text+key->sword), sizeof(double));
+		        if ( key->nzone ) va = (int) (va / key->dzone);
+#ifdef SAOMOD_ASTRO
+			a->flag = 1;
+			a->value = va;
+		    }
+		    if ( b->flag ) vb = b->value;
+		    else {
+#endif
+		        memcpy(&vb, (void *) (b->text+key->sword), sizeof(double));
+		        if ( key->nzone ) va = (int) (vb / key->dzone);
+#ifdef SAOMOD_ASTRO
+			b->flag = 1;
+			b->value = vb;
+		    }
+#endif
+		}
+
+		diff = va == vb ? 0 : ( va < vb ? -1 : 1 );
+		break;
+	      }
+	     case 't' : {
+		diff = strncmp(a->text+key->sword, b->text+key->sword, key->schar);
+		break;
+	      }
+	     default:
+		fprintf(stderr, "Bad type in binary value compare\n");
+		cleanup();
+		abort();
+	}
+
+	if ( diff ) return diff;
+	continue;
+      }
+#endif
+
+      /* Find the beginning and limit of each field. */
+      if (iter || a->keybeg == NULL || b->keybeg == NULL)
+	{
+	  if ( key->eword >= 0
+#ifdef SAOMOD_TABLE
+|| table
+#endif
+	       ) {
+	    lima = limfield (a, key);
+	    limb = limfield (b, key);
+	  } else {
+	    lima = a->text + a->length;
+	    limb = b->text + b->length;
+	  }
+
+          if (key->sword >= 0) {
+            texta = begfield (a, key); textb = begfield (b, key);
+          } else {
+              texta = a->text; textb = b->text;
+              if (key->skipsblanks
+#ifdef SAOMOD_TABLE
+||table
+#endif
+)
+                {
+                  while (texta < lima && blanks[UCHAR (*texta)])
+                    ++texta;
+                  while (textb < limb && blanks[UCHAR (*textb)])
+                    ++textb;
+                }
+            }
+	}
+      else
+	{
+	  /* For the first iteration only, the key positions have
+	     been precomputed for us. */
+	  texta = a->keybeg; lima = a->keylim;
+	  textb = b->keybeg; limb = b->keylim;
+	}
+
+      /* Find the lengths. */
+      lena = lima - texta; lenb = limb - textb;
+      if (lena < 0)
+	lena = 0;
+      if (lenb < 0)
+	lenb = 0;
+
+      /* Actually compare the fields. */
+      if ( key->numeric ) {
+#ifdef SAOMOD_FIX
+	  if ( *texta != '+' && *texta != '-' && !ISDIGIT((int)*texta) ) {
+	    if ( *textb != '+' && *textb != '-' && !ISDIGIT((int)*textb) ) {
+		diff = memcmp (texta, textb, min(lena, lenb));
+	    } else {
+		diff =  1;
+	    }
+	  } else
+	      if ( *textb != '+' && *textb != '-' && !ISDIGIT((int)*textb) ) {
+		 diff = -1;
+	  } else
+#endif
+#ifdef SAOMOD_ASTRO
+          if ( key->numeric == 2 || key->numeric == 3 ) {
+		double	va;
+		double	vb;
+
+		static int x = 0;
+
+	   if ( iter ) {
+	    if (*lima || *limb) {
+	      char savea = *lima; 
+	      char saveb = *limb;
+
+	      *lima = *limb = '\0';
+
+	      if ( key->numeric == 2 ) {
+	          va = SAOstrtod(texta, NULL);
+	          vb = SAOstrtod(textb, NULL);
+	      } else {
+	          va = mjd(texta, 0);
+	          vb = mjd(textb, 0);
+	      }
+
+	      *lima = savea; *limb = saveb;
+            } else {
+	      if ( key->numeric == 2 ) {
+	          va = SAOstrtod(texta, NULL);
+	          vb = SAOstrtod(textb, NULL);
+	      } else {
+	          va = mjd(texta, 0);
+	          vb = mjd(textb, 0);
+	      }
+	    }
+	   } else {
+		  if ( a->flag ) va = a->value;
+	          else {
+			char savea = *lima;
+
+	      	    *lima = '\0';
+	      	    if ( key->numeric == 2 ) {
+		        va = a->value = SAOstrtod(texta, NULL);
+	      	    } else {
+	                va = mjd(texta, 0);
+		    }
+		    *lima = savea;
+		    a->flag++;
+
+	          }
+	          if ( b->flag ) vb = b->value;
+		  else {
+			char saveb = *limb;
+  
+	      	    *limb = '\0';
+	      	    if ( key->numeric == 2 ) {
+		        vb = b->value = SAOstrtod(textb, NULL);
+	      	    } else {
+	                vb = mjd(textb, 0);
+		    }
+		    *limb = saveb;
+		    b->flag++;
+	          }
+	   }
+
+	   if ( key->nzone ) {
+	     va = (int) (va / key->dzone);
+	     vb = (int) (vb / key->dzone);
+	   }
+
+	   diff = (va < vb) ? -1 : ((va == vb) ? 0 : 1);
+
+	  if ( diff )
+	    return key->reverse ? -diff : diff;
+	  continue;
+       } else
+#endif
+       if ( key->numeric == 1 )
+	{
+	   if (*lima || *limb)
+	    {
+	      char savea = *lima; char saveb = *limb;
+
+	      *lima = *limb = '\0';
+
+	      diff = numcompare (texta, textb);
+	      *lima = savea, *limb = saveb;
+	    } 
+	    else {
+	      diff = numcompare (texta, textb);
+	}
+
+
+	  if (diff)
+	    return key->reverse ? -diff : diff;
+	  continue;
+	}
+#ifdef SAOMOD_FIX
+	  if (diff) /* This catches the text diffs */
+	    return key->reverse ? -diff : diff;
+#endif
+      }
+      else if (key->month)
+	{
+	  diff = getmonth (texta, lena) - getmonth (textb, lenb);
+	  if (diff)
+	    return key->reverse ? -diff : diff;
+	  continue;
+	}
+      else if (ignore && translate)
+	while (texta < lima && textb < limb)
+	  {
+	    while (texta < lima && ignore[UCHAR (*texta)])
+	      ++texta;
+	    while (textb < limb && ignore[UCHAR (*textb)])
+	      ++textb;
+	    if (texta < lima && textb < limb &&
+		translate[UCHAR (*texta++)] != translate[UCHAR (*textb++)])
+	      {
+		diff = translate[UCHAR (*--texta)] - translate[UCHAR (*--textb)];
+		break;
+	      }
+	    else if (texta == lima && textb < limb) diff = -1;
+	    else if (texta < lima && textb == limb) diff = 1;
+	  }
+      else if (ignore)
+	while (texta < lima && textb < limb)
+	  {
+	    while (texta < lima && ignore[UCHAR (*texta)])
+	      ++texta;
+	    while (textb < limb && ignore[UCHAR (*textb)])
+	      ++textb;
+	    if (texta < lima && textb < limb && *texta++ != *textb++)
+	      {
+		diff = *--texta - *--textb;
+		break;
+	      }
+	    else if (texta == lima && textb < limb) diff = -1;
+	    else if (texta < lima && textb == limb) diff = 1;
+	  }
+      else if (translate)
+	while (texta < lima && textb < limb)
+	  {
+	    if (translate[UCHAR (*texta++)] != translate[UCHAR (*textb++)])
+	      {
+		diff = translate[UCHAR (*--texta)] - translate[UCHAR (*--textb)];
+		break;
+	      }
+	  }
+      else
+	diff = memcmp (texta, textb, min (lena, lenb));
+
+      if (diff)
+	return key->reverse ? -diff : diff;
+      if ((diff = lena - lenb) != 0)
+	return key->reverse ? -diff : diff;
+    }
+
+  return 0;
+}
+
+/* Compare two lines A and B, returning negative, zero, or positive
+   depending on whether A compares less than, equal to, or greater than B. */
+
+static int
+compare (a, b)
+     register struct line *a, *b;
+{
+  int diff, tmpa, tmpb, mini;
+
+  /* First try to compare on the specified keys (if any).
+     The only two cases with no key at all are unadorned sort,
+     and unadorned sort -r. */
+  if (keyhead.next)
+    {
+      diff = keycompare (a, b);
+      if (diff != 0)
+	return diff;
+      if (unique || stable)
+	return 0;
+    }
+
+  /* If the keys all compare equal (or no keys were specified)
+     fall through to the default byte-by-byte comparison. */
+  tmpa = a->length, tmpb = b->length;
+  mini = min (tmpa, tmpb);
+  if (mini == 0)
+    diff = tmpa - tmpb;
+  else
+    {
+      char *ap = a->text, *bp = b->text;
+
+      diff = UCHAR (*ap) - UCHAR (*bp);
+      if (diff == 0)
+	{
+	  diff = memcmp (ap, bp, mini);
+	  if (diff == 0)
+	    diff = tmpa - tmpb;
+	}
+    }
+
+  return reverse ? -diff : diff;
+}
+
+/* Check that the lines read from the given FP come in order.  Return
+   1 if they do and 0 if there is a disorder. */
+
+static int	line;
+static int
+checkfp (fp)
+     FILE *fp;
+{
+  struct buffer buf;		/* Input buffer. */
+  struct lines lines;		/* Lines scanned from the buffer. */
+  struct line *prev_line;	/* Pointer to previous line. */
+  struct line temp;		/* Copy of previous line. */
+  int cc;			/* Character count. */
+  int cmp;			/* Result of calling compare. */
+  int alloc, i, success = 1;
+
+  initbuf (&buf, mergealloc);
+  initlines (&lines, mergealloc / linelength + 1,
+	     LINEALLOC / ((NMERGE + NMERGE) * sizeof (struct line)));
+  alloc = linelength;
+  temp.text = xmalloc (alloc);
+
+  cc = fillbuf (&buf, fp);
+  findlines (&buf, &lines);
+
+  if (cc)
+    do
+      {
+
+	/* Compare each line in the buffer with its successor. */
+	for (i = 0; i < lines.used - 1; ++i)
+	  {
+	    line++;
+	    cmp = compare (&lines.lines[i], &lines.lines[i + 1]);
+	    if ((unique && cmp >= 0) || (cmp > 0))
+	      {
+		success = 0;
+		goto finish;
+	      }
+	  }
+
+	/* Save the last line of the buffer and refill the buffer. */
+	prev_line = lines.lines + lines.used - 1;
+	if (prev_line->length > alloc)
+	  {
+	    while (prev_line->length + 1 > alloc)
+	      alloc *= 2;
+	    temp.text = xrealloc (temp.text, alloc);
+	  }
+	memcpy (temp.text, prev_line->text, prev_line->length + 1);
+	temp.length = prev_line->length;
+	temp.keybeg = temp.text + (prev_line->keybeg - prev_line->text);
+	temp.keylim = temp.text + (prev_line->keylim - prev_line->text);
+#ifdef SAOMOD_ASTRO
+	temp.flag  = prev_line->flag;
+	temp.value = prev_line->value;
+#endif
+
+	cc = fillbuf (&buf, fp);
+	if (cc)
+	  {
+	    findlines (&buf, &lines);
+	    /* Make sure the line saved from the old buffer contents is
+	       less than or equal to the first line of the new buffer. */
+	    cmp = compare (&temp, &lines.lines[0]);
+	    if ((unique && cmp >= 0) || (cmp > 0))
+	      {
+		success = 0;
+		break;
+	      }
+	  }
+      }
+    while (cc);
+
+finish:
+  xfclose (fp);
+  free (buf.buf);
+  free ((char *) lines.lines);
+  free (temp.text);
+  return success;
+}
+
+/* Merge lines from FPS onto OFP.  NFPS cannot be greater than NMERGE.
+   Close FPS before returning. */
+
+static void
+mergefps (fps, nfps, ofp)
+     FILE *fps[], *ofp;
+     register int nfps;
+{
+  struct buffer buffer[NMERGE];	/* Input buffers for each file. */
+  struct lines lines[NMERGE];	/* Line tables for each buffer. */
+  struct line saved;		/* Saved line for unique check. */
+  int savedflag = 0;		/* True if there is a saved line. */
+  int savealloc = 0;		/* Size allocated for the saved line. */
+  int cur[NMERGE];		/* Current line in each line table. */
+  int ord[NMERGE];		/* Table representing a permutation of fps,
+				   such that lines[ord[0]].lines[cur[ord[0]]]
+				   is the smallest line and will be next
+				   output. */
+  register int i, j, t;
+
+  /* Allocate space for a saved line if necessary. */
+  if (unique)
+    {
+      savealloc = linelength;
+      saved.text = xmalloc (savealloc);
+#ifdef SAOMOD_ASTRO
+      saved.flag = 0;
+#endif
+    }
+
+  /* Read initial lines from each input file. */
+  for (i = 0; i < nfps; ++i)
+    {
+      initbuf (&buffer[i], mergealloc);
+      /* If a file is empty, eliminate it from future consideration. */
+      while (i < nfps && !fillbuf (&buffer[i], fps[i]))
+	{
+	  xfclose (fps[i]);
+	  --nfps;
+	  for (j = i; j < nfps; ++j)
+	    fps[j] = fps[j + 1];
+	}
+      if (i == nfps)
+	free (buffer[i].buf);
+      else
+	{
+	  initlines (&lines[i], mergealloc / linelength + 1,
+		     LINEALLOC / ((NMERGE + NMERGE) * sizeof (struct line)));
+	  findlines (&buffer[i], &lines[i]);
+	  cur[i] = 0;
+	}
+    }
+
+  /* Set up the ord table according to comparisons among input lines.
+     Since this only reorders two items if one is strictly greater than
+     the other, it is stable. */
+  for (i = 0; i < nfps; ++i)
+    ord[i] = i;
+  for (i = 1; i < nfps; ++i)
+    if (compare (&lines[ord[i - 1]].lines[cur[ord[i - 1]]],
+		 &lines[ord[i]].lines[cur[ord[i]]]) > 0)
+      t = ord[i - 1], ord[i - 1] = ord[i], ord[i] = t, i = 0;
+
+  /* Repeatedly output the smallest line until no input remains. */
+  while ( nfps )
+    {
+      /* If uniqified output is turned on, output only the last of
+	 an identical series of lines. */
+      if (unique)
+	{	int cmp;
+
+	  if ( savedflag ) {
+		cmp = compare (&saved, &lines[ord[0]].lines[cur[ord[0]]]);
+
+	      if ( !cmp ) {
+		 savedflag++;
+	      } else {
+		  if ( savedflag >= 1 ) {
+		   if ( !differ ) {
+		      if ( countr )
+			fprintf(ofp, "%d\t", savedflag);
+		      xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+		      if ( !BinarySort ) putc ('\n', ofp);
+#endif
+		   } else {
+		       if ( (differ == 1 && savedflag == 1)
+			 || (differ == 2 && savedflag >= 2) ) {
+			  xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+			  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+		       }
+		   }
+
+		   if ( differ == 3 ) setcnt++;
+
+		   savedflag = 0;
+		  }
+	      }
+	  }
+
+	  if ( !savedflag) {
+	      if (savealloc < lines[ord[0]].lines[cur[ord[0]]].length + 1)
+		{
+		  while (savealloc < lines[ord[0]].lines[cur[ord[0]]].length + 1)
+		    savealloc *= 2;
+		  saved.text = xrealloc (saved.text, savealloc);
+		}
+	      saved.length = lines[ord[0]].lines[cur[ord[0]]].length;
+	      memcpy (saved.text, lines[ord[0]].lines[cur[ord[0]]].text,
+		     saved.length + 1);
+	      if (lines[ord[0]].lines[cur[ord[0]]].keybeg != NULL)
+		{
+		  saved.keybeg = saved.text +
+		    (lines[ord[0]].lines[cur[ord[0]]].keybeg
+		     - lines[ord[0]].lines[cur[ord[0]]].text);
+		}
+	      if (lines[ord[0]].lines[cur[ord[0]]].keylim != NULL)
+		{
+		  saved.keylim = saved.text +
+		    (lines[ord[0]].lines[cur[ord[0]]].keylim
+		     - lines[ord[0]].lines[cur[ord[0]]].text);
+		}
+
+#ifdef SAOMOD_ASTRO
+	      saved.flag  = lines[ord[0]].lines[cur[ord[0]]].flag;
+	      saved.value = lines[ord[0]].lines[cur[ord[0]]].value;
+#endif
+
+	      savedflag = 1;
+	  }
+
+	  if ( differ == 3 ) {
+	      fprintf(ofp, "%d\t", setcnt);
+	      xfwrite (lines[ord[0]].lines[cur[ord[0]]].text, 1,
+		       lines[ord[0]].lines[cur[ord[0]]].length, ofp);
+#ifdef SAOMOD_BINARY
+	      if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	  }
+
+	  if ( savedflag >= 2 && differ == 4 ) {
+		  if ( savedflag == 2 ) {
+		    xfwrite (saved.text, 1,
+			     saved.length, ofp);
+#ifdef SAOMOD_BINARY
+		    if ( !BinarySort ) putc ('\n', ofp);
+#endif
+		  }
+		  xfwrite (lines[ord[0]].lines[cur[ord[0]]].text, 1,
+			   lines[ord[0]].lines[cur[ord[0]]].length, ofp);
+#ifdef SAOMOD_BINARY
+		  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	  }
+
+	}
+
+      else {
+	  xfwrite (lines[ord[0]].lines[cur[ord[0]]].text, 1,
+		   lines[ord[0]].lines[cur[ord[0]]].length, ofp);
+#ifdef SAOMOD_BINARY
+	  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+      }
+
+      /* Check if we need to read more lines into core. */
+      if (++cur[ord[0]] == lines[ord[0]].used){
+	if (fillbuf (&buffer[ord[0]], fps[ord[0]]))
+	  {
+	    findlines (&buffer[ord[0]], &lines[ord[0]]);
+	    cur[ord[0]] = 0;
+	  }
+	else
+	  {
+	    /* We reached EOF on fps[ord[0]]. */
+	    for (i = 1; i < nfps; ++i)
+	      if (ord[i] > ord[0])
+		--ord[i];
+	    --nfps;
+	    xfclose (fps[ord[0]]);
+	    free (buffer[ord[0]].buf);
+	    free ((char *) lines[ord[0]].lines);
+	    for (i = ord[0]; i < nfps; ++i)
+	      {
+		fps[i] = fps[i + 1];
+		buffer[i] = buffer[i + 1];
+		lines[i] = lines[i + 1];
+		cur[i] = cur[i + 1];
+	      }
+	    for (i = 0; i < nfps; ++i)
+	      ord[i] = ord[i + 1];
+	    continue;
+	  }
+      }
+      /* The new line just read in may be larger than other lines
+	 already in core; push it back in the queue until we encounter
+	 a line larger than it. */
+      for (i = 1; i < nfps; ++i)
+	{
+	  t = compare (&lines[ord[0]].lines[cur[ord[0]]],
+		       &lines[ord[i]].lines[cur[ord[i]]]);
+	  if (!t)
+	    t = ord[0] - ord[i];
+	  if (t < 0)
+	    break;
+	}
+      t = ord[0];
+      for (j = 1; j < i; ++j)
+	ord[j - 1] = ord[j];
+      ord[i - 1] = t;
+    }
+
+  if (unique && savedflag)
+    {
+      if ( !differ && savedflag >= 1 )
+	{
+	  if ( countr )
+	    fprintf(ofp, "%d\t", savedflag);
+
+	  xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+	  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	}
+
+      if ( (differ == 1 && savedflag == 1)
+        || (differ == 2 && savedflag >= 2) ) {
+	  xfwrite (saved.text, 1,
+		   saved.length, ofp);
+#ifdef SAOMOD_BINARY
+	  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+      }
+
+      free (saved.text);
+    }
+}
+
+/* Sort the array LINES with NLINES members, using TEMP for temporary space. */
+
+static void
+sortlines (lines, nlines, temp)
+     struct line *lines, *temp;
+     int nlines;
+{
+  register struct line *lo, *hi, *t;
+  register int nlo, nhi;
+
+  if (nlines == 2)
+    {
+      if (compare (&lines[0], &lines[1]) > 0)
+	*temp = lines[0], lines[0] = lines[1], lines[1] = *temp;
+      return;
+    }
+
+  nlo = nlines / 2;
+  lo = lines;
+  nhi = nlines - nlo;
+  hi = lines + nlo;
+
+  if (nlo > 1)
+    sortlines (lo, nlo, temp);
+
+  if (nhi > 1)
+    sortlines (hi, nhi, temp);
+
+  t = temp;
+
+  while (nlo && nhi)
+    if (compare (lo, hi) <= 0)
+      *t++ = *lo++, --nlo;
+    else
+      *t++ = *hi++, --nhi;
+  while (nlo--)
+    *t++ = *lo++;
+
+  for (lo = lines, nlo = nlines - nhi, t = temp; nlo; --nlo)
+    *lo++ = *t++;
+}
+
+/* Check that each of the NFILES FILES is ordered.
+   Return a count of disordered files. */
+
+
+static int
+check (files, nfiles)
+     char *files[];
+     int nfiles;
+{
+  int i, disorders = 0;
+  FILE *fp;
+
+  for (i = 0; i < nfiles; ++i)
+    {
+      fp = xfopen (files[i], "r");
+      line = 0;
+      if (!checkfp (fp))
+	{
+	  printf ("%s: disorder on %s at line %d\n", program_name, files[i]
+		, line);
+	  ++disorders;
+	}
+    }
+  return disorders;
+}
+
+/* Merge NFILES FILES onto OFP. */
+
+static void
+merge (files, nfiles, ofp)
+     char *files[];
+     int nfiles;
+     FILE *ofp;
+{
+  int i, j, t;
+  char *temp;
+  FILE *fps[NMERGE], *tfp;
+
+#ifdef SAOMOD_TABLE
+  static TableHead	TH = NULL;
+         TableHead	th;
+#endif
+
+  int	 saveunique = unique;
+
+  unique = 0;
+
+  while (nfiles > NMERGE)
+    {
+      t = 0;
+      for (i = 0; i < nfiles / NMERGE; ++i)
+	{
+	  for (j = 0; j < NMERGE; ++j) {
+	    fps[j] = xfopen (files[i * NMERGE + j], "r");
+#ifdef SAOMOD_TABLE
+	    if ( table == 2 ) {
+		    if ( TH == NULL ) TH = table_header(fps[j], TABLE_PARSE);
+		    else {
+				int	k;
+
+			th = table_header(fps[j], TABLE_PARSE);
+			for ( k = 0; k < table_ncol(TH); k++ )
+			    if ( strcmp(table_colnam(TH, k + 1), table_colnam(th, k + 1)) ) {
+				fprintf(stderr, "sorttable: can't merge tables with different column definitions: \"%\"s != \"%s\"\n", table_colnam(TH, k+1), table_colnam(th, k+1));
+				exit(1);
+			    }
+			table_hdrfree(th);
+		    }
+	    }
+#endif
+	  }
+
+
+	  tfp = xfopen (temp = tempname (), "w");
+	  mergefps (fps, NMERGE, tfp);
+	  xfclose (tfp);
+	  for (j = 0; j < NMERGE; ++j)
+	    zaptemp (files[i * NMERGE + j]);
+	  files[t++] = temp;
+	}
+
+      for (j = 0; j < nfiles % NMERGE; ++j) {
+	fps[j] = xfopen (files[i * NMERGE + j], "r");
+#ifdef SAOMOD_TABLE
+	    if ( table == 2 ) {
+		    if ( TH == NULL ) TH = table_header(fps[j], TABLE_PARSE);
+		    else {
+				int	k;
+
+			th = table_header(fps[j], TABLE_PARSE);
+			for ( k = 0; k < table_ncol(TH); k++ )
+			    if ( strcmp(table_colnam(TH, k + 1), table_colnam(th, k + 1)) ) {
+				fprintf(stderr, "sorttable: can't merge tables with different column definitions: \"%s\" != \"%s\"\n", table_colnam(TH, k+1), table_colnam(th, k+1));
+				exit(1);
+			    }
+			table_hdrfree(th);
+		    }
+	    }
+#endif
+      }
+
+
+      tfp = xfopen (temp = tempname (), "w");
+      mergefps (fps, nfiles % NMERGE, tfp);
+      xfclose (tfp);
+      for (j = 0; j < nfiles % NMERGE; ++j)
+	zaptemp (files[i * NMERGE + j]);
+      files[t++] = temp;
+      nfiles = t;
+    }
+
+  for (i = 0; i < nfiles; ++i) {
+    fps[i] = xfopen (files[i], "r");
+#ifdef SAOMOD_TABLE
+	    if ( table == 2 ) {
+		    if ( TH == NULL ) TH = table_header(fps[i], TABLE_PARSE);
+		    else {
+				int	k;
+
+			th = table_header(fps[i], TABLE_PARSE);
+			for ( k = 0; k < table_ncol(TH); k++ ) {
+			    if ( strcmp(table_colnam(TH, k + 1), table_colnam(th, k + 1)) ) {
+				fprintf(stderr, "sorttable: can't merge tables with different column definitions: \"%s\" != \"%s\"\n", table_colnam(TH, k+1), table_colnam(th, k+1));
+				exit(1);
+			    }
+			}
+			table_hdrfree(th);
+		    }
+	    }
+#endif
+  }
+
+  unique = saveunique;
+  mergefps (fps, i, ofp);
+  for (i = 0; i < nfiles; ++i)
+    zaptemp (files[i]);
+}
+
+/* Sort NFILES FILES onto OFP. */
+
+static void
+sort (files, nfiles, ofp)
+     char **files;
+     int nfiles;
+     FILE *ofp;
+{
+  struct buffer buf;
+  struct lines lines;
+  struct line saved;		/* Saved line for unique check. */
+  int	savedflag = 0;
+  int savealloc = 0;		/* Size allocated for the saved line. */
+  struct line *tmp;
+  int i, ntmp;
+  FILE *fp, *tfp;
+  struct tempnode *node;
+  int ntemp = 0;
+  char **tempfiles;
+
+  initbuf (&buf, sortalloc);
+  initlines (&lines, sortalloc / linelength + 1,
+	     LINEALLOC / sizeof (struct line));
+  ntmp = lines.alloc;
+  tmp = (struct line *) xmalloc (ntmp * sizeof (struct line));
+
+  /* Allocate space for a saved line if necessary. */
+  if (unique)
+    {
+      savealloc = linelength;
+      saved.text = xmalloc (savealloc);
+#ifdef SAOMOD_ASTRO
+      saved.flag = 0;
+#endif
+    }
+
+  while (nfiles--)
+    {
+      fp = xfopen (*files++, "r");
+      while (fillbuf (&buf, fp))
+	{
+	  findlines (&buf, &lines);
+	  if (lines.used > ntmp)
+	    {
+	      while (lines.used > ntmp)
+		ntmp *= 2;
+	      tmp = (struct line *)
+		xrealloc ((char *) tmp, ntmp * sizeof (struct line));
+	    }
+	  sortlines (lines.lines, lines.used, tmp);
+	  if (feof (fp) && !nfiles && !ntemp && !buf.left)
+	    tfp = ofp;
+	  else
+	    {
+	      ++ntemp;
+	      tfp = xfopen (tempname (), "w");
+	    }
+	  if ( !unique || tfp != ofp )
+	      for (i = 0; i < lines.used; ++i) {
+		xfwrite (lines.lines[i].text, 1, lines.lines[i].length, tfp);
+#ifdef SAOMOD_BINARY
+		if ( !BinarySort ) putc ('\n', tfp);
+#endif
+	      }
+	  else {
+	    for (i = 0; i < lines.used; ++i) {
+		int cmp;
+
+	      if ( savedflag ) {
+		    cmp = compare (&saved, &lines.lines[i]);
+
+		  if ( !cmp ) {
+		     savedflag++;
+		  } else {
+		      if ( savedflag >= 1 ) {
+		       if ( !differ ) {
+			  if ( countr )
+			    fprintf(ofp, "%d\t", savedflag);
+			  xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+			  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+		       } else {
+			   if ( (differ == 1 && savedflag == 1)
+			     || (differ == 2 && savedflag >= 2) ) {
+			      xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+			      if ( !BinarySort ) putc ('\n', ofp);
+#endif
+			   }
+		       }
+
+		       if ( differ == 3 ) setcnt++;
+		       savedflag = 0;
+		      }
+		  }
+	      }
+
+	      if ( !savedflag) {
+		  if (savealloc < lines.lines[i].length + 1)
+		    {
+		      while (savealloc < lines.lines[i].length + 1)
+			savealloc *= 2;
+		      saved.text = xrealloc (saved.text, savealloc);
+		    }
+		  saved.length = lines.lines[i].length;
+		  memcpy (saved.text, lines.lines[i].text,
+			 saved.length + 1);
+		  if (lines.lines[i].keybeg != NULL)
+		    {
+		      saved.keybeg = saved.text +
+			(lines.lines[i].keybeg - lines.lines[i].text);
+		    }
+		  if (lines.lines[i].keylim != NULL)
+		    {
+		      saved.keylim = saved.text +
+			(lines.lines[i].keylim - lines.lines[i].text);
+		    }
+
+#ifdef SAOMOD_ASTRO
+		  saved.flag  = lines.lines[i].flag;
+		  saved.value = lines.lines[i].value;
+#endif
+
+		  savedflag = 1;
+	      }
+
+	      if ( differ == 3 ) {
+		  fprintf(ofp, "%d\t", setcnt);
+		  xfwrite (lines.lines[i].text, 1, lines.lines[i].length, ofp);
+#ifdef SAOMOD_BINARY
+		  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	      }
+
+	      if ( savedflag >= 2 && differ == 4 ) {
+		      if ( savedflag == 2 ) {
+			xfwrite (saved.text, 1,
+				 saved.length, ofp);
+#ifdef SAOMOD_BINARY
+			if ( !BinarySort ) putc ('\n', ofp);
+#endif
+		      }
+		      xfwrite (lines.lines[i].text, 1, lines.lines[i].length, ofp);
+#ifdef SAOMOD_BINARY
+		      if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	      }
+
+	    }
+          }
+	  if (tfp != ofp)
+	    xfclose (tfp);
+	}
+      xfclose (fp);
+    }
+
+  if (unique && savedflag)
+    {
+      if ( !differ && savedflag >= 1 )
+	{
+	  if ( countr )
+	    fprintf(ofp, "%d\t", savedflag);
+
+	  xfwrite (saved.text, 1, saved.length, ofp);
+#ifdef SAOMOD_BINARY
+	  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+	}
+
+      if ( (differ == 1 && savedflag == 1)
+        || (differ == 2 && savedflag >= 2) ) {
+	  xfwrite (saved.text, 1,
+		   saved.length, ofp);
+#ifdef SAOMOD_BINARY
+	  if ( !BinarySort ) putc ('\n', ofp);
+#endif
+      }
+
+      free (saved.text);
+    }
+
+  free (buf.buf);
+  free ((char *) lines.lines);
+  free ((char *) tmp);
+
+  if (ntemp)
+    {
+      tempfiles = (char **) xmalloc (ntemp * sizeof (char *));
+      i = ntemp;
+      for (node = temphead.next; i > 0; node = node->next)
+	tempfiles[--i] = node->name;
+      merge (tempfiles, ntemp, ofp);
+      free ((char *) tempfiles);
+    }
+}
+
+/* Insert key KEY at the end of the list (`keyhead'). */
+
+static void
+insertkey (key)
+     struct keyfield *key;
+{
+  struct keyfield *k = &keyhead;
+
+  while (k->next)
+    k = k->next;
+  k->next = key;
+  key->next = NULL;
+}
+
+static void
+badfieldspec (s)
+     char *s;
+{
+  fprintf (stderr, "invalid field specification `%s'", s);
+  exit(2);
+}
+
+/* Handle interrupts and hangups. */
+
+static void
+sighandler (sig)
+     int sig;
+{
+#ifdef _POSIX_VERSION
+  struct sigaction sigact;
+
+  sigact.sa_handler = SIG_DFL;
+  sigemptyset (&sigact.sa_mask);
+  sigact.sa_flags = 0;
+  sigaction (sig, &sigact, NULL);
+#else				/* !_POSIX_VERSION */
+  signal (sig, SIG_DFL);
+#endif				/* _POSIX_VERSION */
+  cleanup ();
+#if HAVE_MINGW32==0
+  kill (getpid (), sig);
+#else
+  exit(1);
+#endif
+}
+
+/* Set the ordering options for KEY specified in S.
+   Return the address of the first character in S that
+   is not a valid ordering option.
+   BLANKTYPE is the kind of blanks that 'b' should skip. */
+
+static char *
+set_ordering (s, key, blanktype)
+     char *s;
+     struct keyfield *key;
+     enum blanktype blanktype;
+{
+  while (*s)
+    {
+      switch (*s)
+	{
+	case 'b':
+	  if (blanktype == bl_start || blanktype == bl_both)
+	    key->skipsblanks = 1;
+	  if (blanktype == bl_end || blanktype == bl_both)
+	    key->skipeblanks = 1;
+	  break;
+	case 'd':
+	  key->ignore = nondictionary;
+	  break;
+	case 'f':
+	  key->translate = fold_toupper;
+	  break;
+#if 0
+	case 'g':
+	  /* Reserved for comparing floating-point numbers. */
+	  break;
+#endif
+	case 'i':
+	  key->ignore = nonprinting;
+	  break;
+	case 'M':
+	  key->month = 1;
+	  break;
+	case 'n':
+	  key->nzone   = 0;
+	  key->numeric = 1;
+	  break;
+#ifdef SAOMOD_ASTRO
+	case 'h':
+	  key->nzone   = 0;
+	  key->numeric = 2;
+	  break;
+#endif
+	case 'q':
+	  key->nzone   = 0;
+	  key->numeric = 3;
+	  break;
+#ifdef SAOMOD_ASTRO
+	case 'z':
+	  key->nzone = 1;
+	  key->numeric = 2;
+	  s++;
+	  key->dzone = SAOstrtod(s, &s);
+	  s--;
+	  break;
+#endif
+	case 'r':
+	  key->reverse = 1;
+	  break;
+	default:
+	  return s;
+	}
+      ++s;
+    }
+  return s;
+}
+
+int main (argc, argv)
+     int argc;
+     char *argv[];
+{
+  struct keyfield *key = NULL, gkey;
+  char *s;
+  int i, t, t2;
+  int checkonly = 0, mergeonly = 0, nfiles = 0;
+  char *minus = "-", *outfile = minus, **files, *tmp;
+  FILE *ofp;
+#ifdef _POSIX_VERSION
+  struct sigaction oldact, newact;
+#endif				/* _POSIX_VERSION */
+#ifdef SAOMOD_FIX
+  int pipes[4];
+  char *ss=NULL, *tt=NULL, *uu=NULL;
+#endif
+
+  program_name = argv[0];
+
+#ifdef SAOMOD_FIX
+  /* Launch() sometimes rearranges passed pipes to be stdin/stdout */
+  if( (ss=getenv("LAUNCH_PIPES")) ){
+    tt = (char *)strdup(ss);
+    for(i=0, uu=(char *)strtok(tt, ","); i<4 && uu; 
+	i++, uu=(char *)strtok(NULL,",")){
+      pipes[i] = atoi(uu);
+    }
+    if( tt ) free(tt);
+    if( i < 4 ) return(1);
+    close(pipes[0]);
+    close(pipes[3]);
+    dup2(pipes[2], 0);  close(pipes[2]);
+    dup2(pipes[1], 1);  close(pipes[1]);
+  }
+#endif
+
+#ifdef SAOMOD_FIX
+  if ( (program_name = (char *)strrchr(program_name, '/')) )
+    program_name++;
+  else
+    program_name = argv[0];
+#endif
+
+#ifdef SAOMOD_TABLE
+  if ( strstr(program_name, "table") ) {
+	table = 1;
+	tab   = '\t';
+  }
+#endif
+
+#ifdef SAOMOD_FIX
+  /* Ask for a stable sort 
+   */
+  stable = 1;
+#endif
+  
+  have_read_stdin = 0;
+  inittables ();
+
+  temp_file_prefix = getenv ("TMPDIR");
+  if (temp_file_prefix == NULL)
+    temp_file_prefix = DEFAULT_TMPDIR;
+
+#ifdef _POSIX_VERSION
+  newact.sa_handler = sighandler;
+  sigemptyset (&newact.sa_mask);
+  newact.sa_flags = 0;
+
+  sigaction (SIGINT, NULL, &oldact);
+  if (oldact.sa_handler != SIG_IGN)
+    sigaction (SIGINT, &newact, NULL);
+#if HAVE_MINGW32==0
+  sigaction (SIGHUP, NULL, &oldact);
+  if (oldact.sa_handler != SIG_IGN)
+    sigaction (SIGHUP, &newact, NULL);
+  sigaction (SIGPIPE, NULL, &oldact);
+  if (oldact.sa_handler != SIG_IGN)
+    sigaction (SIGPIPE, &newact, NULL);
+#endif
+  sigaction (SIGTERM, NULL, &oldact);
+  if (oldact.sa_handler != SIG_IGN)
+    sigaction (SIGTERM, &newact, NULL);
+#else				/* !_POSIX_VERSION */
+  if (signal (SIGINT, SIG_IGN) != SIG_IGN)
+    signal (SIGINT, sighandler);
+#if HAVE_MINGW32==0
+  if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
+    signal (SIGHUP, sighandler);
+  if (signal (SIGPIPE, SIG_IGN) != SIG_IGN)
+    signal (SIGPIPE, sighandler);
+#endif
+  if (signal (SIGTERM, SIG_IGN) != SIG_IGN)
+    signal (SIGTERM, sighandler);
+#endif				/* !_POSIX_VERSION */
+
+  gkey.sword = gkey.eword = -1;
+  gkey.ignore = NULL;
+  gkey.translate = NULL;
+  gkey.nzone = gkey.numeric = gkey.month = gkey.reverse = 0;
+  gkey.skipsblanks = gkey.skipeblanks = 0;
+
+  files = (char **) xmalloc (sizeof (char *) * argc);
+
+  for (i = 1; i < argc; ++i)
+    {
+      if( !strcasecmp(argv[1], "--help") ){
+	usage(0);
+      }
+      if (argv[i][0] == '+')
+	{
+	  if (key)
+	    insertkey (key);
+	  key = (struct keyfield *) xmalloc (sizeof (struct keyfield));
+	  key->eword = -1;
+	  key->ignore = NULL;
+	  key->translate = NULL;
+	  key->skipsblanks = key->skipeblanks = 0;
+	  key->nzone = key->numeric = key->month = key->reverse = 0;
+	  s = argv[i] + 1;
+	  if (!digits[UCHAR (*s)]) {
+	    switch ( *s ) {
+	     case 'c' :
+	     case 'C' :
+	     case 'b' :
+	     case 'B' :
+	     case 's' :
+	     case 'S' :
+	     case 'i' :
+	     case 'I' :
+	     case 'l' :
+	     case 'f' :
+	     case 'd' :
+	     case 't' :
+#ifdef SAOMOD_BINARY
+		if ( !BinarySort ) BinarySort = -1;
+#endif
+		key->btype = *s;
+		s++;
+
+		break;
+	    
+	     default:
+	    	badfieldspec (argv[i]);
+	    }
+	   }
+	  for (t = 0; digits[UCHAR (*s)]; ++s)
+	    t = 10 * t + *s - '0';
+	  t2 = 0;
+	  if (*s == '.')
+	    for (++s; digits[UCHAR (*s)]; ++s)
+	      t2 = 10 * t2 + *s - '0';
+	  if (t2 || t)
+	    {
+	      key->sword = t;
+	      key->schar = t2;
+	    }
+	  else {
+#ifdef SAOMOD_BINARY
+	    if ( BinarySort == 0 ) {
+		key->sword = -1;
+		key->schar = 0;
+	    } else {
+#endif
+	      key->sword = t;
+	      key->schar = t2;
+#ifdef SAOMOD_BINARY
+	    }
+#endif
+	  }
+	  s = set_ordering (s, key, bl_start);
+	  if (*s)
+	    badfieldspec (argv[i]);
+	}
+      else if (argv[i][0] == '-' && argv[i][1])
+	{
+	  s = argv[i] + 1;
+	  if (digits[UCHAR (*s)])
+	    {
+	      if (!key)
+		usage (2);
+	      for (t = 0; digits[UCHAR (*s)]; ++s)
+		t = t * 10 + *s - '0';
+	      t2 = 0;
+	      if (*s == '.')
+		for (++s; digits[UCHAR (*s)]; ++s)
+		  t2 = t2 * 10 + *s - '0';
+	      key->eword = t;
+	      key->echar = t2;
+	      s = set_ordering (s, key, bl_end);
+	      if (*s)
+		badfieldspec (argv[i]);
+	      insertkey (key);
+	      key = NULL;
+	    }
+	  else
+	    while (*s)
+	      {
+		s = set_ordering (s, &gkey, bl_both);
+		switch (*s)
+		  {
+#ifdef SAOMOD_BINARY
+		  case 'B' :
+		    s++;
+		    BinarySort = strtol(s, &s, 10);
+		    linelength = BinarySort;
+		    break;
+#endif
+		  case '\0':
+		    break;
+		  case 'c':
+		    checkonly = 1;
+		    break;
+		  case 'k':
+		    if (s[1])
+		      ++s;
+		    else
+		      {
+			if (i == argc - 1){
+			  fprintf (stderr, "option `-k' requires an argument");
+			  exit(2);
+			}
+			else
+			  s = argv[++i];
+		      }
+		    if (key)
+		      insertkey (key);
+		    key = (struct keyfield *)
+		      xmalloc (sizeof (struct keyfield));
+		    key->eword = -1;
+		    key->echar =  0;
+		    key->ignore = NULL;
+		    key->translate = NULL;
+		    key->skipsblanks = key->skipeblanks = 0;
+		    key->nzone = key->numeric = key->month = key->reverse = 0;
+		    /* Get POS1. */
+		    if (!digits[UCHAR (*s)])
+		      badfieldspec (argv[i]);
+		    for (t = 0; digits[UCHAR (*s)]; ++s)
+		      t = 10 * t + *s - '0';
+		    if (t)
+		      t--;
+		    t2 = 0;
+		    if (*s == '.')
+		      {
+			for (++s; digits[UCHAR (*s)]; ++s)
+			  t2 = 10 * t2 + *s - '0';
+			if (t2)
+			  t2--;
+		      }
+		    if (t2 || t)
+		      {
+			key->sword = t;
+			key->schar = t2;
+		      }
+		    else
+		      key->sword = -1;
+		    s = set_ordering (s, key, bl_start);
+		    if (*s && *s != ',')
+		      badfieldspec (argv[i]);
+		    else if (*s++)
+		      {
+			/* Get POS2. */
+			for (t = 0; digits[UCHAR (*s)]; ++s)
+			  t = t * 10 + *s - '0';
+			if (t)
+			      t--;
+			t2 = 0;
+			if (*s == '.')
+			  {
+			    for (++s; digits[UCHAR (*s)]; ++s)
+			      t2 = t2 * 10 + *s - '0';
+			    if (t2)
+			      t2--;
+			  }
+			key->eword = t;
+			key->echar = t2;
+			s = set_ordering (s, key, bl_end);
+			if (*s)
+			  badfieldspec (argv[i]);
+		      }
+		    insertkey (key);
+		    key = NULL;
+		    goto outer;
+#ifdef SAOMOD_TABLE
+		  case 'm':
+		    mergeonly = 1;
+		    if ( table ) table=2;
+		    break;
+#endif
+		  case 'o':
+		    if (s[1])
+		      outfile = s + 1;
+		    else
+		      {
+			if (i == argc - 1){
+			  fprintf (stderr, "option `-o' requires an argument");
+			  exit(2);
+			}
+			else
+			  outfile = argv[++i];
+		      }
+		    goto outer;
+		  case 's':
+		    stable = 1;
+		    break;
+		  case 't':
+		    if (s[1])
+		      tab = *++s;
+		    else if (i < argc - 1)
+		      {
+			tab = *argv[++i];
+			goto outer;
+		      }
+		    else{
+		      fprintf (stderr, "option `-t' requires an argument");
+		      exit(2);
+		    }
+		    break;
+		  case 'T':
+		    if (s[1])
+		      temp_file_prefix = ++s;
+		    else
+		      {
+			if (i < argc - 1)
+			  temp_file_prefix = argv[++i];
+			else{
+			  fprintf (stderr, "option `-T' requires an argument");
+			  exit(2);
+			}
+		      }
+		    goto outer;
+
+		  case 'u': unique = 1; differ = 0; break;	/* One each only	*/
+		  case 'U': unique = 1; differ = 1; break;	/* Unique lines only	*/
+		  case 'D': unique = 1; differ = 2; break;	/* Duplic lines only	*/
+		  case 'A': unique = 1; differ = 4; break;	/* All Duplic lines 	*/
+		  case 'S': unique = 1; differ = 3; break;	/* Set counter		*/
+		  case 'C': unique = 1; countr = 1; break;	/* Count same lines	*/
+		  case 'y':
+		    /* Accept and ignore e.g. -y0 for compatibility with
+		       Solaris 2.  */
+		    goto outer;
+		  default:
+		    fprintf (stderr, "%s: unrecognized option `-%c'\n",
+			     argv[0], *s);
+		    usage (2);
+		  }
+		if (*s)
+		  ++s;
+	      }
+	}
+      else			/* Not an option. */
+	{
+	  files[nfiles++] = argv[i];
+	}
+    outer:;
+    }
+
+  if (key)
+    insertkey (key);
+
+#ifdef SAOMOD_BINARY
+  if ( BinarySort == -1 ) {
+	fprintf (stderr, "No record length specified with binary file sort flags.\n");
+	usage(2);
+  }
+  if ( BinarySort && key == NULL ) {
+	fprintf (stderr, "Keys must be specified with binary file sort.\n");
+	usage(2);
+  }
+#endif
+
+#ifdef SAOMOD_BINARY
+  /* Inheritance of global options to individual keys. */
+if ( !BinarySort ) {
+  for (key = keyhead.next; key; key = key->next)
+    if (!key->ignore && !key->translate && !key->skipsblanks && !key->reverse
+	&& !key->skipeblanks && !key->month && !key->numeric && !key->nzone)
+      {
+	key->ignore = gkey.ignore;
+	key->translate = gkey.translate;
+	key->skipsblanks = gkey.skipsblanks;
+	key->skipeblanks = gkey.skipeblanks;
+	key->month = gkey.month;
+	key->numeric = gkey.numeric;
+	key->reverse = gkey.reverse;
+	key->nzone   = gkey.nzone;
+	key->dzone   = gkey.dzone;
+
+      }
+
+  if (!keyhead.next && (gkey.ignore || gkey.translate || gkey.skipsblanks
+			|| gkey.skipeblanks || gkey.month || gkey.numeric))
+    insertkey (&gkey);
+}
+#endif
+
+  reverse = gkey.reverse;
+
+  if (nfiles == 0)
+    {
+      nfiles = 1;
+      files = &minus;
+    }
+
+  if (checkonly)
+    exit (check (files, nfiles) != 0);
+
+  if (strcmp (outfile, "-"))
+    {
+      struct stat outstat;
+      if (stat (outfile, &outstat) == 0)
+	{
+	  /* The following code prevents a race condition when
+	     people use the brain dead shell programming idiom:
+		  cat file | sort -o file
+	     This feature is provided for historical compatibility,
+	     but we strongly discourage ever relying on this in
+	     new shell programs. */
+
+	  /* Temporarily copy each input file that might be another name
+	     for the output file.  When in doubt (e.g. a pipe), copy.  */
+	  for (i = 0; i < nfiles; ++i)
+	    {
+	      char buf[8192];
+	      FILE *fp;
+	      int cc;
+
+	      if (S_ISREG (outstat.st_mode) && strcmp (outfile, files[i]))
+		{
+		  struct stat instat;
+		  if ((strcmp (files[i], "-")
+		       ? stat (files[i], &instat)
+		       : fstat (fileno (stdin), &instat)) != 0)
+		    {
+		      perror (files[i]);
+		      cleanup ();
+		      exit (2);
+		    }
+		  if (S_ISREG (instat.st_mode)
+		      && (instat.st_ino != outstat.st_ino
+			  || instat.st_dev != outstat.st_dev))
+		    {
+		      /* We know the files are distinct.  */
+		      continue;
+		    }
+		}
+
+	      fp = xfopen (files[i], "r");
+	      tmp = tempname ();
+	      ofp = xfopen (tmp, "w");
+	      while ((cc = fread (buf, 1, sizeof buf, fp)) > 0)
+		xfwrite (buf, 1, cc, ofp);
+	      if (ferror (fp))
+		{
+  	          fprintf (stderr, "%s", files[i]);
+		  cleanup ();
+		  exit (2);
+		}
+	      xfclose (ofp);
+	      xfclose (fp);
+	      files[i] = tmp;
+	    }
+	}
+      ofp = xfopen (outfile, "w");
+    }
+  else
+    ofp = stdout;
+
+  if (mergeonly)
+    merge (files, nfiles, ofp);
+  else
+    sort (files, nfiles, ofp);
+  cleanup ();
+
+  /* If we wait for the implicit flush on exit, and the parent process
+     has closed stdout (e.g., exec >&- in a shell), then the output file
+     winds up empty.  I don't understand why.  This is under SunOS,
+     Solaris, Ultrix, and Irix.  This premature fflush makes the output
+     reappear. --karl@cs.umb.edu  */
+  if (fflush (ofp) < 0)
+    perror (outfile);
+
+  if (have_read_stdin && fclose (stdin) == EOF)
+    perror (outfile);
+  if (ferror (stdout) || fclose (stdout) == EOF)
+    perror (outfile);
+
+  return(0);
+}
+
+static void
+usage (status)
+     int status;
+{
+  if (status != 0)
+    fprintf (stderr, "Try `%s --help' for more information.\n",
+	     program_name);
+  else
+    {
+      fprintf(stderr,"Usage: %s [OPTION]... [FILE]...\n", program_name);
+      fprintf(stderr,"Write sorted concatenation of all FILE(s) to standard output.\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"+POS1 [-POS2]    start a key at POS1, end it before POS2\n");
+      fprintf(stderr,"-M               compare (unknown) < `JAN' < ... < `DEC', imply -b\n");
+      fprintf(stderr,"-T DIRECT        use DIRECT for temporary files, not $TMPDIR or %s\n", DEFAULT_TMPDIR);
+      fprintf(stderr,"-b               ignore leading blanks in sort fields or keys\n");
+      fprintf(stderr,"-c               check if given files already sorted, do not sort\n");
+      fprintf(stderr,"-d               consider only [a-zA-Z0-9 ] characters in keys\n");
+      fprintf(stderr,"-f               fold lower case to upper case characters in keys\n");
+      fprintf(stderr,"-i               consider only [\\040-\\0176] characters in keys\n");
+      fprintf(stderr,"-k POS1[,POS2]   same as +POS1 [-POS2], but all positions counted from 1\n");
+      fprintf(stderr,"-m               merge already sorted files, do not sort\n");
+      fprintf(stderr,"-n               compare according to string numerical value, imply -b\n");
+      fprintf(stderr,"-o FILE          write result on FILE instead of standard output\n");
+      fprintf(stderr,"-r               reverse the result of comparisons\n");
+      fprintf(stderr,"-s               stabilize sort by disabling last resort comparison\n");
+      fprintf(stderr,"-t SEP           use SEParator instead of non- to whitespace transition\n");
+      fprintf(stderr,"-u               with -c, check for strict ordering\n");
+      fprintf(stderr,"-u               with -m, only output the first of an equal sequence\n");
+      fprintf(stderr,"-U		   output only unique records.\n");
+      fprintf(stderr,"-D		   output only duplicate records.\n");
+      fprintf(stderr,"--help       display this help and exit\n");
+      fprintf(stderr,"--version    output version information and exit\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"Binary File Options:\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"-Blen		record length in bytes\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"+<type1>offset1 +<type2>.offset2 ...\n");
+      fprintf(stderr,"or\n");
+      fprintf(stderr,"+<type1>offset1.len1 ... (+t text data only)\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"where <type> can be:\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"c		character data\n");
+      fprintf(stderr,"C		unsigned character data\n");
+      fprintf(stderr,"b		byte data\n");
+      fprintf(stderr,"B		unsigned byte data\n");
+      fprintf(stderr,"s		short data\n");
+      fprintf(stderr,"S		unsigned short data\n");
+      fprintf(stderr,"i		integer data\n");
+      fprintf(stderr,"I		unsigned integer data\n");
+      fprintf(stderr,"f		float data\n");
+      fprintf(stderr,"d		double data\n");
+      fprintf(stderr,"t		text data\n");
+      fprintf(stderr,"\n");
+      fprintf(stderr,"POS is F[.C][OPTS], where F is the field number and C the character\n");
+      fprintf(stderr,"position in the field, both counted from zero.  OPTS is made up of one\n");
+      fprintf(stderr,"or more of Mbdfinr; this effectively disables global -Mbdfinr settings\n");
+      fprintf(stderr,"for that key.  If no key given, use the entire line as key.  With no\n");
+      fprintf(stderr,"FILE, or when FILE is -, read standard input.\n");
+      fprintf(stderr,"\n");
+    }
+  exit (status);
+}
+